Air-compressor.



K PATENTED MAY 29, 1906. H. B. CORNISH.

AIR COMPRESSOR.

APPLloATIoN FILED PEB. 2. 19b5.

2 SHEETS-SHEET l.

PATENTED MAY 29, 1906.

H. B. CORNISH.

AIR COMPRESSOR.

APPLICATION FILED PEB. z. 1905.

2 SHEETS-SHEET 2.

v 5714, r A "j" UNICria-:o srarns (PATENT OFFICE.

' HARRY B. coRNisH," OFMI'NNEAPOLIS. MiiuaEsoriA,l AssiGNoR or TWO- wTo. all whom tuta/y. concern.-

Be itknown that I, HARRY B. CORNISH, of

V No. 821,926.

Minneapolis, Hennepin county, Minnesota,

have invented certain new and useful Im provements in Air-Compressors,of which-the ollowing is a specification. j

My invention relates to air-compressors designed particularly' for usein connection with a carbureter for supplying compressed airv thereto;and the object of the invention is to provide a positive/ and reliablecompressor and one that is easily operated, of simple c onstruction, andstrong and durable.

A further and particular object kof the invention is to provide acompressor wherein` all leakin and sticking joints and packing areentire y eliminated.

The invention consists generally in various constructions andcombinations, all as here'- inafter described, and particularly pointedout in the claims.

In the accompanying drawings, form-ing part of this specification,Figure 1 is a vertical section of an air-compressor embodying myinvention.A Fig. 2 is a vertical sectional f view of the lower or 'valveportion of the comressor. Fig. 3 is a horizontal section on the ine :nof Fig. 2. Fig. 4 is a detail sectional view ofthe pipes leading fromthe upper part ofthe compressor to the carbureter.

In the drawings, 2 represents a casing com posed of two sections havingtheir contlguous edges provided with flanges 3, between which a diahragm 4, of any suitable material, preferab) A pipe 6 leads from the topof the casing above the diaphragm to a carbureter (not shown) and isprovided with a check-valve 7 and a branch pipe 8, having an air-inletvalve 9. The bottom of the casing has openings 10, through which air isadmitted to the space beneath the piston'. y 11 is a castingcentrallyarranged `with respect to the diaphragm and fitting within an oening therein and secured to the edge of t e diaphragm around theopening by a plate 12. This casting'l and the diaphragm Aform the pistonof the compressor. The

low depending stem 14 is centrally mounted stem l14 and is (providedwith aca the vcup the edge o the dialy rubber, is secured by bolts 5. flbelow the .diaphragm- THiRDsrO P. PETERsoN, 0F GLENWoonJMINNEsOTA. l

` .Am-ooMPnEsson. i

. Patented Maize, 190e.

` Ain the casting 11, andia mechanism o erated `byfluidressure,hereinafter descri ed, is

iprovided or raising thisstem and the casting thereon to compress .theair in the upper` part of the casing and force it past the checkvalve tothecarbureter. The stem 14' has a lon'gbearing-surfacef'15 in the bottomof the casing, and a pipe 16, secured to the bottom. of said casing,'incloses the lower end 'of said stem. Port-holes V16 lead from theinterior of saidpipe into the casing 2 to allow the free passage ofairfrom one tothe other. A castingv 17 is provided below the said pipe,having a iange`18 at its upper end, betweenpwhich and a ring. 19 theedge of a dia hragm20, also of suitable material, preferably' rubber, isse"-n cured. The lower end of the pipe 16 fits within the ring 19above'the diaphra in. A cup 21 is screwed onto thelower en 'of the 22,between which an 'phragm 20, .around a central vhole therein, issecured. This vcup and its diaphragm form a second piston of lessarea-than the one irst l described and upon which the fluid acts direct.

A rod 23 extendsthrough the cap 22 up into the stem 14 and is providedat its upper end with a button 24, between which and said cap acoil-spring 25 is-.arranged This s ring is put under compression 'b theinitial) u ward movement of the4 diap agm 20 to aid in seating theinlet-valve and holding the same on its seat untilthe ressure is.relieved tube 26 is interposed between said s ring and the rod 23 andadapted to rest at its ower end upon said cap.V

The walls of the cup 21 are of sufficient area to form a' backing forthe diaphragm 20 during the downward movement of the .operating rmechanism.

Below the'casting 17 isa shell 27, supported on a base 28 and having anintake-port 29 for air ror water communicating with a governor 30 andleading to a chamber 31 in said base. Awall 32 is rovided in the shell27,

)having aport 33 a a ted to be closed by a valve 34, carried by t elower end of a stem 35. yThe port 33 leads to a chamber 36, and a port37 extends through the wall 38 to a chamber 39, that communicates Withthe eX- haust lor discharge pipe 40. .The valve-stem projects throughthe port 37,-and in place of providinga packing-box at' this point use'adiaphra m 41, of suitable material, preferably ru ber, secured at itsouter edge between the wall 38 and a c'ap 42-andhavingfa central openingto receive'the valve-stem` vided ywithin the vcasting 17 incommunication with the chamber 36 through a vertical port 46.V Water orair pressure is thus alowed t^ass around the diaphragm 41 into thechamber 45 and act upon the diaphragm 20 to raise. the pistons andcompress the air in lthe u per part -of the casing n2. v The lower en ofthe rod 23 is connected to the upper end of the valve-stem, and a valve47 is provided at this pointto normally'close an opening 48, leading tothe exhaust-chamber39. H

" The operation of the compressor, assuming the parts to bein theposition shown in Figs. 1 and'2, is as follows: Air or water beingadmitted through the port 29 will iow up throu h the valve 34, past thediaphragm 41, into tlgie chamber 45, and raise the diaphragm 20, andwith it the piston 11, which'having a' much greater area'I than, thelower one will compressa larger volume of air. During the initial upward.movement of the diaphragm 20 the spring 25, as before-described, willbe compressed, and when the parts have been elevated a certainpredeternnned distance the tube 26 will engage the button 24 and, aided,

by the tension of the spring 25, lift the rod23 to unseat theexhaust-valve 47 and close the intake-valve 34.V When the intake-valveis closed, the assage of Huid into the chamber 45 will -be c ecked andthe exhaust-valve being o ened willrelieve the pessure in said cham' erbeneath f the diap agm 20, and

when -the pressure has been reduced suiciently the diaplhragms willdescend by gravity and allow t e rod 23 and the-valves .connectedtherewith to return to their normal osition. As soon as the'intake-valve has been opened the fluid `will flow through again intothechamber beneath the diaphragm 20 and the operation describedrepeated.

I claim as my invention- 1. Thecombination, witha casing havingintakeand exhaust ports arranged one above another and intake andexhaust'valves, said intake-valve being normally open and saidexhaust-valve closed, and said valves -having ,intake-valve, su

senese ment of' said diaphragm to aid 'inseatingsaid I stantially asdescribed. 2-.` The combination, wltha casing having intake and exhaustports and' valves therefor provided 'withr 'a stem or rod, the intake-1valve being normally open and the exhaustvalveclosed, oa/diaphragmwithin said casing having anoenng to receive said rod, means interposebetween said diaphragm and the free end of said rod foi-.causing thelongitudinalamovement of said rodand the closing. of said intake-,valveand the opening of i' the exhaustv whensaid diaphragm 1s raised,

and anair-compressing diaphragm connected with said irst-'named "dlahragm and ef greater diameter whereby a argervolume of .l

air will be compressed.

l3. The combination, with a casing having v intake and exhaust ports andyvalves therefor, the intake-valve being normally open and theexhaust-valve'closed by avity, of a diaphragm located within said-rcasing, a

" ',valve stemor rod projecting through said diaphragm and provided witha stop, a coilspring provided on said rod between said lstop and diaphraIn and (put under com res 'movement o sai sion'by .the initia upwardlaphragm, and a tube carried 'by said diaphragm withinfsaid Yspring andarranged to engage said stop during the final upward movement of saiddiaphragm to -yclose said intake-valve and open the exhaust.

4. The combination, with a casing having intake and exhaust ports andvalves therefor, said valves having a common stem and one beine''normally open and the other closed, o a diaphragm provided on said stembetween said ports and separating one from the other, and said casinghaving a port leading from said intake-valve .around said` diaphragm andsaid exhaust-valve, a second exhaust-valve, means arran ed to operate'said valves when said secon has moved upward a certain predetermineddistance, an area than said second diap agm and cated above `the sameand connected therewith whereby alarger volume of air'will becompressed, substantially as described.

5. The combination, with a casing having intake and exhaust ports oneabove l/the other and valves therefor provided with a stem or .rod, saidintake-valve being normally open and said exhaust-valve normally closed,and the exhaust-passa e communicating with said exhaust-port' einglocated between said valves, of a diaphragm within said c'asin above`said valves, means arranged to e actuated by the upward movement of.said diaphragm for moving said rod to close said intake-valve and opensaid exhaust, and said casing being l rovided with va port leading fromsaid inta ,e-valve to a I pomt beneath said diaphragm around said athird diaphragm Aof reater diaphragm provided in -said casing. aboveVsai I vI'O exhaust-passage and' said exhaust-valve, substantlally asdescribed.

6. The combination, with a casing having intake and exhaust ports andvalves therefor, said intake bein normally open and said exhaust-valveclose the said casing having an exhaust-passage communicating With saidexhaust-port and bein between said valves, and a' port leading rom saidinletvalve around said exhaust-valve, said valve having a stemconnecting them one with another, and a rod forming a continuation ofsaid stem, of a diaphragm inclosin said stem between said valves, asecond diap ragm within said .casing above `said valves, and meansarranged to be actuated by the upward movement of said second-nameddiaphragm to impart a longitudinal movement to said rod to seat saidinlet-valve and open the exhaust, substantially as described.

7. The combination, with a casing having intake and exhaust ports andvalves therefor, said intake-valve being normally open and saidexhaust-valve normally closed by gravity, and said valves bein providedwith a stern or rod, of a diaphragmavin an opening through which saidrod exten s, a coilspring provided on-said rod and arranged to be comressed by the initial upward movement o said dia hragm to aid. inseating said .intake-valve vw en said diaphragm has moved to apredetermined point, and a second diaphragm of greater area than saidirstnamed diaphragm and. connected therewith, whereby a larger volume ofair will be'compressed.

8. The combination, with a casing having intake and. exhaust ports andvalves therefor provided with a stem or rod, said intakevalve beingnormally open and said exhaustvalve closed by gravity, of a diaphragmhaving an opening through which said rod extends, a spring provided onsaid rod and arranged to be put under tension by the initial upwardmovement of said diaphragm, and means operated during the final movementof said diaphragm for positively actuating said rod to seat saidinlet-valve and open said exhaust-valve, substantially as described.

9. The combination, with a casing having intake and exhaust ports andvalves provided with a rod, the intake-valve being normally open and theexhaust closed, of a diaphragm located within said casing above saidvalves and having an opening to receive said rod, means operated by theupward movement of said diaphragm for seating said intake-valve andopening said exhaust, a second diaphragm above and connected withv valveclosed, the said casing having an ex- A haust-passage communicating withsaid exhaust-port between said valves, a chamber 45 above saidexhaust-valve and a chamber 36 above said intake-valve, the said casinghavin a port leading from said chamber 36 to sai chamber 45, of adiaphragm inclosing said stem between said valves and separating saidchamber 36 from said exhaust-passage, a second diaphragm located in saidchamber 45, and having a sliding connection with said rod, and meansactuated by the u ward movement of said second diaphragm or imparting alon itudinal movement to said rod to seat said in et-valve and open theexhaust, substantially as described.

In witness whereof I have hereunto set my hand this 26th day of January,1905.

HARRY B. CORNSH. Witnesses:

RICHARD PAUL, C.- MACNAMARA.

